feat: 跨实例同步移植第9轮（游戏设置编辑器）

搬入 game-settings-modal（游戏选项精细编辑，10 文件）：设置行编辑器、按键绑定、语言选择与文案表。新增 app-settings-modal provider 与 instance-settings-context 转发，并把 instance-settings 的 closeModal 改为支持关闭回调。SyncSettings 恢复游戏设置入口。补齐 game-options 相关 en-US / zh-CN 文案。

apps/app-frontend/src/components/ui/instance_settings/SyncSettings.vue

@@ -35,6 +35,7 @@ import CommandHistoryModal from '../settings/instances/command-history-modal.vue
 import SyncedServersModal from '../settings/instances/servers-modal.vue'
 import SyncedPacksModal from '../settings/instances/SyncedPacksModal.vue'
 import SyncSourceModal from '../settings/instances/SyncSourceModal.vue'
+import GameSettingsModal from '../settings/instances/game-settings-modal/index.vue'
 
 const { handleError } = injectNotificationManager()
 const { formatMessage } = useVIntl()
@@ -42,6 +43,7 @@ const queryClient = useQueryClient()
 const syncedPacksModal = ref<InstanceType<typeof SyncedPacksModal>>()
 const commandHistoryModal = ref<InstanceType<typeof CommandHistoryModal>>()
 const syncedServersModal = ref<InstanceType<typeof SyncedServersModal>>()
+const gameSettingsModal = ref<InstanceType<typeof GameSettingsModal> | null>(null)
 
 const messages = defineMessages({
 	globalOptionsTitle: {
@@ -513,8 +515,7 @@ function editGlobalOption(row: (typeof globalRows)[number]) {
 	if (row.editable === 'resourcepack' || row.editable === 'datapack') {
 		void syncedPacksModal.value?.show(row.editable)
 	} else if (row.editable === 'game-settings') {
-		// Game settings modal is ported in a later pass.
-		return
+		openGameSettings()
 	} else if (row.editable === 'commands') {
 		void commandHistoryModal.value?.show()
 	} else {
@@ -522,6 +523,15 @@ function editGlobalOption(row: (typeof globalRows)[number]) {
 	}
 }
 
+function openGameSettings() {
+	if (!hasGameOptionsToEdit.value) return
+	gameSettingsModal.value?.show()
+}
+
+async function handleGameSettingsSaved() {
+	await invalidateSyncedOptions()
+}
+
 
 
 function clearBaseSource() {
@@ -537,6 +547,7 @@ onScopeDispose(clearBaseSource)
 		<SyncedPacksModal ref="syncedPacksModal" />
 		<CommandHistoryModal ref="commandHistoryModal" />
 		<SyncedServersModal ref="syncedServersModal" />
+		<GameSettingsModal ref="gameSettingsModal" @saved="handleGameSettingsSaved" />
 
 		<SyncSourceModal
 			ref="baseModal"